Hi,

3y-x=5   ⇒  x =  

4y+2x=40

4y+2()=40

4y + 6y - 10 = 40

    10y = 50

      y = 5

      x =  

CHECKING our answer***

Using 3y-x = 5

    15-10 = 5

Wish You the Best in your Studies.







 

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